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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>标题标记</title>
</head>
<body>
<h1>这是1级标题</h1>
<h2>这是2级标题</h2>
<h3>这是3级标题</h3>
<h4>这是4级标题</h4>
<h5>这是5级标题</h5>
<h6>这是6级标题</h6>
</body>
</html>

